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authorBjorn Helgaas <bhelgaas@google.com>2018-06-25 08:17:33 -0500
committerBjorn Helgaas <helgaas@kernel.org>2018-06-26 08:22:45 -0500
commit6f6f42466d902c92f21b46a45e6af22d1d663607 (patch)
tree473b6e3aefa5dfaabcfac86f29dd075628fbef43 /drivers/pci/Makefile
parentce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff)
PCI: shpchp: Manage SHPC unconditionally on non-ACPI systems
An SHPC can be operated either by platform firmware or by the OS. The OS uses a host bridge ACPI _OSC method to negotiate for control of SHPC. If firmware wants to prevent an OS from operating an SHPC, it must supply an _OSC method that declines to grant SHPC ownership to the OS. If acpi_pci_find_root() returns NULL, it means there's no ACPI host bridge device (PNP0A03 or PNP0A08) and hence no _OSC method, so the OS is always allowed to manage the SHPC. Fix a NULL pointer dereference when CONFIG_ACPI=y but the current hardware/firmware platform doesn't support ACPI. In that case, acpi_get_hp_hw_control_from_firmware() is implemented but acpi_pci_find_root() returns NULL. Fixes: 90cc0c3cc709 ("PCI: shpchp: Add shpchp_is_native()") Link: https://lkml.kernel.org/r/20180621164715.28160-1-marc.zyngier@arm.com Reported-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/pci/Makefile')
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